DE3784327T2 - OPTICAL READER. - Google Patents

OPTICAL READER.

Info

Publication number
DE3784327T2
DE3784327T2 DE8787118575T DE3784327T DE3784327T2 DE 3784327 T2 DE3784327 T2 DE 3784327T2 DE 8787118575 T DE8787118575 T DE 8787118575T DE 3784327 T DE3784327 T DE 3784327T DE 3784327 T2 DE3784327 T2 DE 3784327T2
Authority
DE
Germany
Prior art keywords
light beam
prism element
objective lens
generating source
glass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE8787118575T
Other languages
German (de)
Other versions
DE3784327D1 (en
Inventor
Hiroshi Yoshimatsu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Application granted granted Critical
Publication of DE3784327D1 publication Critical patent/DE3784327D1/en
Publication of DE3784327T2 publication Critical patent/DE3784327T2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
    • G11B11/10515—Reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10532—Heads
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers

Landscapes

  • Optical Head (AREA)
  • Holo Graphy (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Polarising Elements (AREA)

Abstract

An optical pick-up apparatus comprises a light beam generating source (2), an objective lens (5) for causing a light beam from the light beam generating source (2) to impinge upon a record medium (6) and receiving a reflected light beam from the record medium (6), a composite prism (21) constituted by a glass prism element (22), a crystal prism element (23) and a multi-layer (21a) of dielectric material provided between the glass and crystal prism elements (22, 23) which are bonded together, and so disposed that the light beam from the beam generating source (2) and the reflected light beam from the objective lens (5) enter into the glass prism element (22) through respective different optical paths, the light beam from the beam generating source (2) is directed to the objective lens (5) after passing through the glass prism element (22) and at least two light beams obtained based on the reflected light beam from the objective lens (5) emerge from the crystal prism element(23), and a photodetecting unit (26) for detecting separately the light beams emerging from the crystal prism element (23) of the composite prism (21).
DE8787118575T 1986-12-25 1987-12-15 OPTICAL READER. Expired - Fee Related DE3784327T2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61310484A JPH0777038B2 (en) 1986-12-25 1986-12-25 Optical pickup device

Publications (2)

Publication Number Publication Date
DE3784327D1 DE3784327D1 (en) 1993-04-01
DE3784327T2 true DE3784327T2 (en) 1993-09-09

Family

ID=18005788

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8787118575T Expired - Fee Related DE3784327T2 (en) 1986-12-25 1987-12-15 OPTICAL READER.

Country Status (6)

Country Link
US (1) US5077723A (en)
EP (1) EP0273295B1 (en)
JP (1) JPH0777038B2 (en)
KR (1) KR960000825B1 (en)
AT (1) ATE86044T1 (en)
DE (1) DE3784327T2 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2597249B1 (en) * 1986-04-11 1988-06-17 Thomson Csf OPTICAL READING DEVICE FOR OPTICAL RECORDING MEDIUM
JP2982965B2 (en) * 1989-09-18 1999-11-29 オリンパス光学工業株式会社 Optical reader
US5272685A (en) * 1989-12-22 1993-12-21 Kabushiki Kaisha Toshiba Optical system for an information processing apparatus
JP2798185B2 (en) * 1990-07-26 1998-09-17 キヤノン株式会社 Optical head for magneto-optical information reproducing device
US5621714A (en) * 1994-02-12 1997-04-15 Olympus Optical Co., Ltd. Optical pick-up apparatus having hologram and beam splitter with birefringent member and polarizing film
US5541906A (en) * 1994-07-29 1996-07-30 Olympus Optical Co., Ltd. Optical head for magneto-optical record medium
JPH08321088A (en) * 1995-05-25 1996-12-03 Sony Corp Optical pickup
WO1999016061A1 (en) * 1997-09-22 1999-04-01 Seagate Technology, Inc. Apparatus and method for differential wax-wane focusing and push-pull tracking for magneto-optical data storage
JP2003085813A (en) * 2001-09-07 2003-03-20 Minebea Co Ltd Information recording and reproducing device for recording medium
KR102044864B1 (en) * 2012-12-13 2019-12-06 삼성디스플레이 주식회사 Laser patterning examing apparatus
CA2913482C (en) * 2013-05-27 2018-05-15 Huawei Technologies Co., Ltd. Filter, method for producing filter, and laser wavelength monitoring apparatus

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH068934B2 (en) * 1982-01-11 1994-02-02 オリンパス光学工業株式会社 Luminous flux combiner
JPS58221812A (en) * 1982-06-18 1983-12-23 Hitachi Ltd Element for forming natural light
DE3378140D1 (en) * 1982-07-14 1988-11-03 Fujitsu Ltd Polarizing elements
JPS59167855A (en) * 1983-03-14 1984-09-21 Canon Inc Information recording and reproducing device
US4627688A (en) * 1983-07-01 1986-12-09 Sano Kiko Co., Ltd. Beam splitter
JPS6018833A (en) * 1983-07-11 1985-01-30 Nippon Kogaku Kk <Nikon> Magneto-optical recording and reproducing device having double beam splitter
JPS6053863A (en) * 1983-09-05 1985-03-27 Sony Corp Apparatus for detecting magnetizing direction of magnetic recording medium
JPS6055537A (en) * 1983-09-06 1985-03-30 Nippon Kogaku Kk <Nikon> Magneto-optical reproduction method using asymmetric kerr effect and recording medium and reproducer using said reproduction method
JPH0756710B2 (en) * 1983-11-24 1995-06-14 シャープ株式会社 Optical device of magneto-optical storage device
JPS60151855A (en) * 1984-01-20 1985-08-09 Olympus Optical Co Ltd Photomagnetic pickup device
JPS61177655A (en) * 1985-01-31 1986-08-09 Olympus Optical Co Ltd Optical magnetic differential reproducing device
JP2592231B2 (en) * 1985-05-15 1997-03-19 セイコーエプソン株式会社 Optical head
DE3665372D1 (en) * 1985-05-31 1989-10-05 Siemens Ag Optical system for guiding the read-out beam in a magneto-optical memory
JPH0677351B2 (en) * 1986-11-15 1994-09-28 ソニー株式会社 Optical pickup device

Also Published As

Publication number Publication date
EP0273295A2 (en) 1988-07-06
ATE86044T1 (en) 1993-03-15
US5077723A (en) 1991-12-31
JPH0777038B2 (en) 1995-08-16
KR880008258A (en) 1988-08-30
EP0273295A3 (en) 1990-06-27
EP0273295B1 (en) 1993-02-24
JPS63161541A (en) 1988-07-05
DE3784327D1 (en) 1993-04-01
KR960000825B1 (en) 1996-01-13

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8328 Change in the person/name/address of the agent

Free format text: PATENTANWAELTE MUELLER & HOFFMANN, 81667 MUENCHEN

8339 Ceased/non-payment of the annual fee